Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.80-4.152.50-2.80
1
7.18
👆🏻
Fracture
Uneven
-
Cleavage
perfect along [010] and [100]
Perfect
Mohs Hardness
3.5-45-6.5
2
10
👆🏻
Chemical Composition
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)